| Dent to Olympia Heights (Florida) | 963.67 mi (1,550.88 km) |
| Dent to Omaha (Nebraska) | 617.29 mi (993.44 km) |
| Dent to On Top of the World Designated Place (Florida) | 709.87 mi (1,142.42 km) |
| Dent to Onalaska (Wisconsin) | 468.72 mi (754.33 km) |
| Dent to Oneida (New York) | 539.30 mi (867.92 km) |
| Dent to Oneonta (New York) | 549.52 mi (884.37 km) |
| Dent to Ontario (California) | 1,850.91 mi (2,978.76 km) |
| Dent to Ontario (Oregon) | 1,691.19 mi (2,721.71 km) |
| Dent to Opa-locka (Florida) | 953.19 mi (1,534.01 km) |
| Dent to Opelika (Alabama) | 452.97 mi (728.99 km) |
| Dent to Opelousas (Louisiana) | 731.22 mi (1,176.78 km) |
| Dent to Orange (California) | 1,868.27 mi (3,006.68 km) |
| Dent to Orange (Texas) | 811.55 mi (1,306.06 km) |
| Dent to Orange City (Florida) | 734.32 mi (1,181.77 km) |
| Dent to Orangeburg (South Carolina) | 446.65 mi (718.81 km) |
